import html2canvas from 'html2canvas'
import jsPDF from 'jspdf'

export default {

  install(Vue,options){
    Vue.prototype.$getPdf = function () {
      let title = this.htmlTitle?this.htmlTitle:new Date().valueOf();
      html2canvas(document.querySelector('#pdfDom'),{
        allowTaint:true
      }).then(function (canvas) {
        let contentWidth = canvas.width;
        let contentHeight = canvas.height;
        let pageHeight = contentWidth / 592.28 * 841.89;
        let leftHeight = contentHeight;
        let position = 0;
        let imgWidth = 595.28;
        let imgHeight = 592.28 / contentWidth * contentHeight;
        let pageData = canvas.toDataURL('image/jpeg', 1.0);
        let PDF = new jsPDF('', 'pt', 'a4');
        if (leftHeight < pageHeight) {
          PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
        }else {
          while (leftHeight > 0) {
            PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
            leftHeight -= pageHeight;
            position -= 841.89;
            if (leftHeight > 0) {
              PDF.addPage();
            }
          }
        }
        PDF.save(title + '.pdf');
      })
    }
  }
}
